CN114371257B - Indoor evaluation method for pollution of drilling fluid by carbon dioxide - Google Patents
Indoor evaluation method for pollution of drilling fluid by carbon dioxide Download PDFInfo
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- 238000005553 drilling Methods 0.000 title claims abstract description 134
- 239000012530 fluid Substances 0.000 title claims abstract description 134
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 108
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 108
- 238000011156 evaluation Methods 0.000 title claims abstract description 31
- 230000032683 aging Effects 0.000 claims abstract description 101
- 238000000034 method Methods 0.000 claims abstract description 43
- 235000011089 carbon dioxide Nutrition 0.000 claims abstract description 39
- 238000011056 performance test Methods 0.000 claims abstract description 19
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- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 claims description 7
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 claims description 7
- 150000007524 organic acids Chemical class 0.000 claims description 7
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- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims description 4
- KDYFGRWQOYBRFD-UHFFFAOYSA-N Succinic acid Natural products OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 claims description 4
- 239000001361 adipic acid Substances 0.000 claims description 4
- 235000011037 adipic acid Nutrition 0.000 claims description 4
- 150000001412 amines Chemical class 0.000 claims description 4
- JFCQEDHGNNZCLN-UHFFFAOYSA-N anhydrous glutaric acid Natural products OC(=O)CCCC(O)=O JFCQEDHGNNZCLN-UHFFFAOYSA-N 0.000 claims description 4
- KDYFGRWQOYBRFD-NUQCWPJISA-N butanedioic acid Chemical compound O[14C](=O)CC[14C](O)=O KDYFGRWQOYBRFD-NUQCWPJISA-N 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 4
- XBDQKXXYIPTUBI-UHFFFAOYSA-N dimethylselenoniopropionate Natural products CCC(O)=O XBDQKXXYIPTUBI-UHFFFAOYSA-N 0.000 claims description 4
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical compound OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- KYVBNYUBXIEUFW-UHFFFAOYSA-N 1,1,3,3-tetramethylguanidine Chemical compound CN(C)C(=N)N(C)C KYVBNYUBXIEUFW-UHFFFAOYSA-N 0.000 claims description 2
- AQGBTBKGWNVERY-UHFFFAOYSA-L [F-].[K+].[Br-].[Na+] Chemical compound [F-].[K+].[Br-].[Na+] AQGBTBKGWNVERY-UHFFFAOYSA-L 0.000 claims description 2
- XPOLVIIHTDKJRY-UHFFFAOYSA-N acetic acid;methanimidamide Chemical compound NC=N.CC(O)=O XPOLVIIHTDKJRY-UHFFFAOYSA-N 0.000 claims description 2
- 150000001409 amidines Chemical class 0.000 claims description 2
- 239000003054 catalyst Substances 0.000 claims description 2
- WCQOBLXWLRDEQA-UHFFFAOYSA-N ethanimidamide;hydrochloride Chemical compound Cl.CC(N)=N WCQOBLXWLRDEQA-UHFFFAOYSA-N 0.000 claims description 2
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- 235000019260 propionic acid Nutrition 0.000 claims description 2
- IUVKMZGDUIUOCP-BTNSXGMBSA-N quinbolone Chemical compound O([C@H]1CC[C@H]2[C@H]3[C@@H]([C@]4(C=CC(=O)C=C4CC3)C)CC[C@@]21C)C1=CCCC1 IUVKMZGDUIUOCP-BTNSXGMBSA-N 0.000 claims description 2
- 238000010992 reflux Methods 0.000 claims description 2
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 2
- 239000007789 gas Substances 0.000 abstract description 51
- 238000012360 testing method Methods 0.000 abstract description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 4
- 239000003345 natural gas Substances 0.000 abstract description 2
- 239000003209 petroleum derivative Substances 0.000 abstract description 2
- 239000002002 slurry Substances 0.000 description 64
- 239000002689 soil Substances 0.000 description 21
- 238000011049 filling Methods 0.000 description 18
- 239000000203 mixture Substances 0.000 description 11
- 150000001875 compounds Chemical class 0.000 description 9
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- 239000007788 liquid Substances 0.000 description 7
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- ONCZQWJXONKSMM-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical compound O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4].[Si+4].[Si+4].[Si+4] ONCZQWJXONKSMM-UHFFFAOYSA-N 0.000 description 2
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- ZPLCXHWYPWVJDL-UHFFFAOYSA-N 4-[(4-hydroxyphenyl)methyl]-1,3-oxazolidin-2-one Chemical compound C1=CC(O)=CC=C1CC1NC(=O)OC1 ZPLCXHWYPWVJDL-UHFFFAOYSA-N 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/38—Diluting, dispersing or mixing samples
Abstract
The invention discloses an indoor evaluation method for pollution of drilling fluid by carbon dioxide, and belongs to the technical field of petroleum and natural gas drilling fluid engineering. It comprises the following steps: sequentially adding the newly prepared drilling fluid and dry ice into the ageing kettle, and quickly screwing and sealing a tank cover of the ageing kettle; and then placing the ageing kettle into a roller heating furnace, rolling and ageing at a set temperature, taking out, cooling, pouring out drilling fluid, and performing performance test. According to the method, dry ice is adopted to replace carbon dioxide gas for evaluation and test, so that the performance change of the drilling fluid polluted by carbon dioxide can be comprehensively and accurately simulated and measured, and a basis is provided for preventing and treating carbon dioxide pollution of the drilling fluid.
Description
Technical Field
The invention relates to the technical field of petroleum and natural gas drilling fluid engineering, in particular to an indoor evaluation method for pollution of drilling fluid by carbon dioxide.
Background
Current evaluation of CO 2 Experimental device and method for pollution drilling fluid using pressure filling method for indoor CO 2 The principle of the pollution simulation experiment and the pressure infusion method is an ideal gas state equation, and the method generally needs to calculate the infusion pressure of carbon dioxide according to the ideal gas state equation, and in the calculation process, the method comprises the following steps: under the condition that the volume of the drilling fluid is unchanged and the temperature is unchanged after the carbon dioxide gas is filled, the quantity of substances of the gas is in direct proportion to the pressure, however, in the actual drilling process, the environment is very complex, the invasion of the carbon dioxide firstly can influence the pH value of the drilling fluid and also can be influenced by the pH value of the drilling fluid, secondly can lead the volume of the drilling fluid to expand, the temperature also can change, and the pressure filling method is difficult to accurately simulate CO 2 In addition, pressure infusion method is used for indoor CO 2 In the pollution simulation experiment, the performance of the drilling fluid in the aging kettle is tested by directly pouring out the fluid in the kettle and determining the CO in the drilling fluid by adopting a titration method 3 2- 、HCO 3 - The carbon dioxide gas filled into the kettle is not fully absorbed or not, and related detection is not carried out, so that the filling pressure is not practically equal to the carbon dioxide pressure which passes the test and is calculated; secondly, a carbon dioxide steel bottle is needed to be used for filling carbon dioxide gas, and the carbon dioxide steel bottle belongs to a high-pressure container, and the high-pressure carbon dioxide filling is limited by the storage amount of the carbon dioxide in the gas bottle, and the operation of the high-pressure container has a plurality of potential safety hazards, so that the pressure filling method is adopted for carrying out indoor CO 2 The pollution simulation experiment has certain limitations.
However, study of CO 2 Influence law and CO on drilling fluid 2 The treatment method of the polluted drilling fluid is important, and the research work needs scientific evaluation of CO 2 Experimental apparatus and methods for contaminating drilling fluids.
In view of this, the present invention has been made.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an indoor evaluation method for pollution of drilling fluid by carbon dioxide.
The invention is realized in the following way:
the invention provides an indoor evaluation method for pollution of drilling fluid by carbon dioxide, which comprises the following steps:
sequentially adding the newly prepared drilling fluid and dry ice into the ageing kettle, and quickly screwing and sealing a tank cover of the ageing kettle; and then placing the ageing kettle into a roller heating furnace, rolling and ageing at a set temperature, taking out, cooling, pouring out drilling fluid, and performing performance test.
The invention also provides an indoor evaluation method of the treating agent for preventing the drilling fluid from being polluted by carbon dioxide, which comprises the following steps:
sequentially adding the newly prepared drilling fluid and dry ice into the ageing kettle, and quickly screwing and sealing a tank cover of the ageing kettle; then placing the ageing kettle into a roller heating furnace, rolling and ageing at a set temperature, taking out, cooling, pouring out drilling fluid, and performing performance test;
sequentially adding the newly prepared drilling fluid, a treating agent for preventing the drilling fluid from being polluted by carbon dioxide and dry ice into an aging kettle, quickly screwing and sealing a tank cover of the aging kettle, putting the aging kettle into a roller heating furnace, rolling and aging at a set temperature, taking out, cooling, pouring out the drilling fluid, and performing performance test; the performance of the two decanted drilling fluids was compared.
The invention has the following beneficial effects:
the invention provides an indoor evaluation method for carbon dioxide pollution of drilling fluid, which adopts dry ice to replace carbon dioxide gas for evaluation and test, can more accurately simulate and measure the change of the drilling fluid after carbon dioxide pollution, simply and rapidly judge whether carbon dioxide residues exist in an aging kettle through a carbon dioxide indication solution, accurately reflect the relation between the addition amount of the dry ice and the pollution condition of the drilling fluid, and provide a basis for preventing and treating the carbon dioxide pollution of the drilling fluid.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an apparatus for evaluating the contamination of drilling fluid with carbon dioxide.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
Current evaluation of CO 2 Experimental device and method for pollution drilling fluid, and pressure filling method is adopted to carry out indoor CO 2 The pollution simulation experiment comprises the following steps: using a conventional aging tank for drilling fluid, loading the drilling fluid into the aging tank (i.e. aging kettle), and loading CO under a certain pressure 2 Pressing a valve rod at the top of the aging tank into the aging tank, putting the aging tank into a high-temperature roller furnace, rolling for a certain time under the condition of simulating the bottom hole temperature, taking out the aging tank, pouring out the drilling fluid therein after cooling, stirring, and measuring the performance of the drilling fluid. 2 problems that have to be solved by pressure infusion methods: firstly, calculation and metering of pressure and output quantity control, and secondly, customization and design of equipment.
Typically, CO is injected using pressure infusion 2 After the drilling fluid is filled into the aging tank, the drilling fluid is liquid, the volume of the drilling fluid is unchanged in the process of filling gas, namely the volume of the residual space in the aging tank is unchanged, only a part of air in the initial residual space is changed, and after filling carbon dioxide gas, the residual space is filled with the original air and the filled CO 2 And (3) gas. In order to calculate ideal filling pressure conveniently, a virtual baffle plate is arranged in a tank to isolate air from external gas, after the carbon dioxide gas is introduced to reach pressure balance, the volume of the air in the tank is compressed and the pressure is equal to the pressure of the filled carbon dioxide gas, the filling pressure of the carbon dioxide is calculated in a deduction mode according to an ideal gas state equation, and in order to facilitate the actual operation and safety of a pressure filling method, a more reasonable gas concentration range is generally required to be selected, and the simulation calculation is calculated according to the ideal gas state equation under the condition that the volume of drilling fluid is unchanged and the temperature is different, however, in the actual drilling process, the environment is very complex, and the invasion of the carbon dioxide firstly causes the pH value of the drilling fluid to be influenced and also the pH value of the drilling fluid to be influenced; secondly, the volume of the drilling fluid expands and the temperature also changes, so that the simulation calculation process and CO 2 The real process of invasion of drilling fluid in the pit comprisesThe difference, secondly, CO is added under a certain pressure 2 CO is typically supplied by a carbon dioxide cylinder during the pressure in the burn-in canister from the top valve stem of the burn-in canister 2 Filling the carbon dioxide gas cylinder into the aging tank, wherein the carbon dioxide gas cylinder belongs to a high-pressure container, the pressure of filling the low-temperature liquid carbon dioxide into the steel cylinder is generally 6-8MPa, the internal pressure cannot be lower than 0.7MPa when the steel cylinder is used, and the filling cannot be completed at one time when the pressure required to be filled is higher or lower than the pressure.
To solve the problem of adopting pressure filling method to carry out indoor CO 2 The invention provides an evaluation method for pollution of drilling fluid by carbon dioxide. The method adopts dry ice to replace carbon dioxide gas to evaluate the pollution degree of the drilling fluid to carbon dioxide, and in view of the excellent physical property of the dry ice, the method has the advantages that the defects that the carbon dioxide gas is not easy to be pressed into an aging kettle during pressure filling, the limitation of the pressure range of the carbon dioxide gas which can be used for filling and the difference between the pressure calculated according to an ideal gas state equation and the gas pressure of the actual polluted drilling fluid are avoided, the dry ice is put into the drilling fluid, the method is simple and easy to operate, the pressure is easy to calculate and control, the safety is greatly improved, the mixing of the dry ice and the carbon dioxide gas is more uniform, and the CO can be simulated 2 The pollution condition of the drilling fluid by carbon dioxide is accurately reflected in the real process of the underground invasion of the drilling fluid.
The composition and the preparation method of the treating agent for preventing the drilling fluid from being polluted by carbon dioxide, which are used in the invention, can be referred to in the patent of a carbon dioxide complexing agent for the drilling fluid, a preparation method and application thereof, which are filed on the same date by the inventor.
In order to achieve the above purpose of the present invention, the following technical scheme is specifically adopted:
in a first aspect, an embodiment of the present invention provides an indoor evaluation method for pollution of drilling fluid by carbon dioxide, including:
sequentially adding the newly prepared drilling fluid and dry ice into the ageing kettle, and quickly screwing and sealing a tank cover of the ageing kettle; and then placing the ageing kettle into a roller heating furnace, rolling and ageing at a set temperature, taking out, cooling, pouring out drilling fluid, and performing performance test.
The embodiment of the invention provides an indoor evaluation method for carbon dioxide pollution of drilling fluid, which adopts dry ice to replace carbon dioxide gas to evaluate the carbon dioxide pollution degree of the drilling fluid. The dry ice is solid carbon dioxide existing at the temperature of minus 78.5 ℃ under the pressure of 1 standard atmosphere, the cold accumulation of the dry ice is 2 times that of water ice, and the dry ice sublimates into carbon dioxide gas after absorbing heat, so that the dry ice has no residue, toxicity and peculiar smell. The preparation is simple and convenient, the carbon dioxide source is sufficient, and the cost is very low. When the temperature and pressure of the carbon dioxide fluid reach 31.1 ℃ and 7.4MPa, the carbon dioxide fluid is in a supercritical state. Supercritical carbon dioxide has dual properties of gas and liquid: the density is large, usually hundreds of times that of gas, near to liquid; the viscosity is low, two orders of magnitude less than the viscosity of the liquid, and the diffusion coefficient is high, about 10-100 times that of the liquid. The supercritical carbon dioxide stream has the characteristics of low viscosity and readily diffusible gas, high density of liquid and readily dissolvable.
In view of the excellent physical properties of the dry ice, the dry ice is added into the drilling fluid, and the dry ice and the drilling fluid can be fully and uniformly mixed to truly and accurately simulate CO 2 The process of invading the drilling fluid underground reflects the condition that the drilling fluid is polluted.
In an alternative embodiment, the method further comprises: after the ageing kettle is aged, firstly connecting a valve rod on the ageing kettle with a carbon dioxide indicating solution by a pipeline, opening the valve rod on the ageing kettle, observing the color change of the carbon dioxide indicating solution, and judging whether CO exists or not 2 And after the gas is completely released, opening the cover of the ageing kettle, and pouring out the drilling fluid for performance test.
Currently, pressure infusion methods are used for indoor CO 2 The pollution simulation experiment is generally that an aging kettle is put into a roller heating furnace to age and roll at a set temperature, then is taken out, and drilling fluid is poured out for performance test after cooling, and the experiment is ended. Performance testing of the decanted drilling fluid typically uses titration to determine the CO in the decanted drilling fluid 3 2- 、HCO 3 - Judging the pollution degree of the drilling fluid, however, at a certain levelIn some cases, the test shows that the pollution degree of the drilling fluid is serious, and a large amount of carbon dioxide gas possibly exists in the ageing kettle, but usually the part of the carbon dioxide gas is ignored, and only the CO detected in the drilling fluid is focused 3 2- 、HCO 3 - This results in a poor correspondence between the perfusion pressure and the actual detected carbon dioxide content, i.e. the contamination of the drilling fluid by the actual perfusion pressure is not accurately reflected. In the embodiment of the invention, whether the residual carbon dioxide is contained in the aging kettle is judged by using the carbon dioxide indicating solution, so that whether the added dry ice is excessive can be accurately judged, and the relation between the added dry ice amount and the actual pollution degree of the drilling fluid can be truly and accurately reflected. Therefore, the indoor evaluation method for carbon dioxide pollution of the drilling fluid provided by the embodiment of the invention is simple, practical and high in accuracy, and is expected to be widely applied in the actual drilling process.
In an alternative embodiment, the mass ratio of drilling fluid to dry ice is 400:0.5 to 400:5.
In an alternative embodiment, evaluation of drilling fluids contaminated with carbon dioxide is achieved by comparing the pre-aging drilling fluid properties to the post-aging drilling fluid properties.
In an alternative embodiment, performing a performance test on the drilling fluid includes: drilling fluids were tested for AV, PV and YP.
In an alternative embodiment, the aging temperature of the aging tank is 120 ℃ or the formation temperature for 16 hours.
In an alternative embodiment, the drilling fluid to be evaluated is a conventional drilling fluid used in oil and gas field exploration and development.
In a second aspect, the embodiment of the invention further provides an indoor evaluation method of a treating agent for preventing drilling fluid from being polluted by carbon dioxide, which comprises the following steps:
sequentially adding the newly prepared drilling fluid and dry ice into the ageing kettle, and quickly screwing and sealing a tank cover of the ageing kettle; then placing the ageing kettle into a roller heating furnace, rolling and ageing at a set temperature, taking out, cooling, pouring out drilling fluid, and performing performance test;
sequentially adding the drilling fluid, a treating agent for preventing the drilling fluid from being polluted by carbon dioxide and dry ice into an aging kettle, quickly screwing and sealing a tank cover of the aging kettle, putting the aging kettle into a roller heating furnace, rolling and aging at a set temperature, taking out, cooling, pouring out the drilling fluid, and performing performance test; the performance of the two decanted drilling fluids was compared.
The invention also provides an indoor evaluation method of the treatment agent for preventing the drilling fluid from being polluted by the carbon dioxide, wherein the treatment agent for preventing the drilling fluid from being polluted by the carbon dioxide is added in the evaluation process, and the treatment agent for preventing the drilling fluid from being polluted by the carbon dioxide can be used for complexing with the carbon dioxide to form a semi-stable ionic liquid complex, so that the damage effect of the carbon dioxide on the drilling fluid can be reduced.
In an alternative embodiment, the mass ratio of the drilling fluid, the treating agent for preventing the drilling fluid from being polluted by carbon dioxide and the dry ice is 400.0:8.0:0.5-5.0.
In an alternative embodiment, the method further comprises: after the ageing kettle is aged, a valve rod on the ageing kettle is communicated with the carbon dioxide indicating solution through a pipeline, the valve rod on the ageing kettle is opened, the color change of the carbon dioxide indicating solution is observed, after the gas is completely released, a cover of the ageing kettle is opened, and the drilling fluid is poured out for performance test. In an alternative embodiment, the aging temperature of the aging tank is 120 ℃ or the formation temperature for 16 hours.
In an alternative embodiment, the drilling fluid to be evaluated is a conventional drilling fluid used in oil and gas field exploration and development.
In an alternative embodiment, the treating agent for preventing the drilling fluid from being polluted by carbon dioxide comprises a first component and a second component in a mass ratio of 90-95:5-10, wherein the first component is small molecular organic amine obtained by reacting organic acid with carbon number less than or equal to 10 with N' N-dimethyl-1, 3-propylene diamine, and the second component is an amidine compound and/or guanidine compound.
In an alternative embodiment, the first component is a small molecular organic amine prepared by reacting an organic acid having a carbon number less than or equal to 10 with N' N-dimethyl-1, 3-propanediamine in the presence of a sodium fluoride-potassium bromide combination catalyst.
In an alternative embodiment, the organic acid comprises at least one of acetic acid, propionic acid, n-butyric acid, malonic acid, succinic acid, glutaric acid, adipic acid, and sebacic acid, preferably at least one of succinic acid, glutaric acid, and adipic acid.
In an alternative embodiment, the reaction is carried out under an inert atmosphere at a temperature of 110 ℃ to 160 ℃ for a period of 5 to 10 hours;
preferably, the method further comprises: reflux for removing water during the reaction or using molecular sieve for removing water.
In an alternative embodiment, the amidine compound is selected from short-chain amidines, preferably acetamidine hydrochloride or formamidine acetate.
In an alternative embodiment, the guanidine compound is selected from short chain guanidine, preferably tetramethylguanidine or polyhexamethylene guanidine.
The features and capabilities of the present invention are described in further detail below in connection with the examples.
Example 1
Preparation of carbon dioxide indicating solution: adding 0.1 g bromothymol blue into 100 ml 20% ethanol solution to prepare a carbon dioxide indicator; 200mL of tap water is taken, and 2-3g of carbon dioxide indicator is added into the tap water, so that the tap water is the carbon dioxide indicator solution.
Preparing soil slurry: 20g of sodium bentonite is added into 400mL of distilled water, and after stirring for 20min at a high speed of 11000rpm, the mixture is subjected to static airtight hydration for 24h to form soil slurry.
Preparing 4 parts of the soil slurry, namely 1#, 2#, 3#, and 4#; adding 8.0g of a treating agent sample for preventing the drilling fluid from being polluted by carbon dioxide into the slurry No. 2 and the slurry No. 4, and stirring the slurry No. 1, the slurry No. 2, the slurry No. 3 and the slurry No. 4 for 5min under a high-speed stirrer; preparing 4 ageing kettles cleaned by distilled water, checking whether valve rods of the ageing kettles are communicated, screwing the valve rods after confirming the communication, and then loading 4 parts of slurry into the ageing kettles. Sealing the ageing kettles 1# and 2 #; 1.00 g to 1.05g of dry ice is added into the ageing kettles with the slurry in # 3 and # 4, and the ageing kettles are quickly covered within 30 seconds to ensure that no gas leaks out.
The 4 parts of slurry filled into an ageing kettle is heated and rolled for 16 hours at 120 ℃, and then cooled to room temperature; and opening a valve rod of the 3# slurry ageing kettle, and discharging redundant gas. And (3) taking an ageing kettle for containing the No. 4 slurry, communicating the valve rod with a carbon dioxide indicating solution by using a rubber tube (shown in figure 1), slowly opening the valve rod, and observing the color change of the carbon dioxide indicating solution. After the gas in the ageing kettle is released, opening the ageing kettle, pouring slurry No. 1, slurry No. 2, slurry No. 3 and slurry No. 4 in the ageing kettle into a high stirring cup, respectively adding 0.4g polyether modified organic silicon defoaming oil, and stirring the mixture for 20min under a high-speed stirrer;
600r readings of the above 4 parts of slurry were measured at the same temperature (30.+ -. 2 ℃ C.) using a six-speed rotational viscometer, and the AV, PV and YP values were measured.
Judging whether residual carbon dioxide exists in the ageing kettle:
when the valve rod of the ageing kettle of the No. 4 slurry is communicated with the carbon dioxide indicating solution, if the gas in the tank changes the indicating solution from blue to green or yellow, the gas is indicated to contain carbon dioxide; if no gas overflows after the communication or the overflowed gas does not discolor the indication solution, the residual gas is detected without carbon dioxide.
And (3) performance test of the soil slurry in the aging kettle:
the formula of 4,8,12 which is mentioned in the specification of the patent entitled "a carbon dioxide complexing agent for drilling fluid, a preparation method thereof and an application thereof" filed on the same date by the inventor is taken as the formula of a treatment agent for preventing pollution of drilling fluid, and 5% soil slurry, 5% soil slurry+2% formula, 5% soil slurry+0.25% CO are respectively tested 2 5% soil slurry +0.25% CO 2 Viscosity number, AV, PV and YP of a +2% formulation six-speed rotational viscometer, table 1 below shows the experimental results of the rheological effects of the different composition formulated products on the slurry using the method of example 1.
TABLE 1 experimental results of the effect of the formulated products of different compositions on the rheology of the soil slurry
Note that: a is thatV is apparent viscosity in mPa.s; PV is the plastic viscosity in mPas; YP is the dynamic shear force, and the unit is Pa; the soil slurry is original slurry, and the preparation method of the 5% soil slurry comprises the following steps: adding 20g of sodium bentonite into 400mL of distilled water, stirring at a high speed at 11000rpm for 20min, standing, sealing, and hydrating for 24h to form soil slurry; 0.25% CO 2 The representation is: 1g of dry ice is added into 400mL of soil slurry; 2% of the formula represents: 8g of sample was added to 400mL of 5% slurry with the sample formula number being that of Table 2, CO in the slurry 2 Dry ice is specifically used.
Taking the use of the compound product with the formula No. 4 in soil slurry as an example, it can be seen from the table 1 above that 2.0% of the formula No. 4 product is added into the soil slurry, and the readings of a rotational viscometer and AV, PV and YP are reduced, which indicates that the compound product provided by the embodiment of the invention can not thicken the soil slurry, but also can properly reduce the viscosity of the soil slurry; further, dry ice is added into the soil slurry added with the compound product, and the compound product can effectively prevent the soil slurry from suffering CO 2 Pollution of CO 2 The damage to the soil slurry is reduced. The viscosity meter reading and the AV, PV, YP reduction values were maximized with the addition of 2% of the No. 4 slurry, and the performance was optimized with the No. 4 formulation.
Example 2
Similar to the procedure of example 1, the difference is that: the earth slurry is replaced with well slurry.
Judging whether residual carbon dioxide exists in the ageing kettle:
when the valve rod of the ageing kettle of the No. 4 slurry is communicated with the carbon dioxide indicating solution, if the gas in the tank changes the indicating solution from blue to green or yellow, the gas is indicated to contain carbon dioxide; if no gas overflows after the communication or the overflowed gas does not discolor the indication solution, the residual gas is detected without carbon dioxide.
And (3) performance test of well slurry in the aging kettle:
two different well slurries, well slurry +2% formulation, well slurry +0.25% CO were tested separately using formulation No. 4 as formulation for treatment agent to prevent drilling fluid from carbon dioxide contamination 2 Well slurry +0.25% co 2 Viscosity number, AV, PV and YP of a +2% formulation six-speed rotational viscometer,
table 2 below shows the results of the evaluation of the formulated products in two different well slurries using the method of example 1.
Table 2 evaluation results of the formulated product in two different well slurries
Note that: well slurries are slurries to which various treatments, such as polymers, plugging agents, lubricants, and the like, are added. Wherein the addition amount of the well slurry is 400mL, and 0.25% CO 2 1g, reduced volume 0.5L, CO in the slurry 2 Dry ice is specifically used.
The formula 4 is taken as a compound product, and the compound product is used in the well slurry of an MX-132 well as an example, and as can be seen from the table 2, the formula 4 with the concentration of 2.0 percent is added into the well slurry, and the reading and the shearing force of a rotary viscometer of the well slurry are not greatly changed, so that the compound product provided by the embodiment of the invention can not thicken the well slurry, but also has a certain inhibition effect on the thickening of the well slurry; further, dry ice is added into the well slurry added with the compound product, and the compound product can effectively prevent the well slurry from suffering CO 2 Pollution of CO 2 The damage to the soil slurry is reduced.
In summary, the embodiment of the invention provides an indoor evaluation method for pollution of drilling fluid by carbon dioxide, which comprises the following steps: sequentially adding the newly prepared drilling fluid and dry ice into the ageing kettle, and quickly screwing and sealing a tank cover of the ageing kettle; and then placing the ageing kettle into a roller heating furnace, rolling and ageing at a set temperature, taking out, cooling, pouring out drilling fluid, and performing performance test. According to the method, dry ice is adopted to replace carbon dioxide gas for evaluation and test, the pollution degree of the drilling fluid is objectively and truly reflected, the change of the drilling fluid after carbon dioxide pollution can be comprehensively and accurately simulated and measured, and a basis is provided for preventing and treating the carbon dioxide pollution of the drilling fluid.
Meanwhile, the embodiment of the invention also provides an indoor evaluation method of the treating agent for preventing the drilling fluid from being polluted by carbon dioxide, which comprises the following steps: sequentially adding the newly prepared drilling fluid and dry ice into the ageing kettle, and quickly screwing and sealing a tank cover of the ageing kettle; then placing the ageing kettle into a roller heating furnace, rolling and ageing at a set temperature, taking out, cooling, pouring out drilling fluid, and performing performance test; sequentially adding the newly prepared drilling fluid, a treating agent for preventing the drilling fluid from being polluted by carbon dioxide and dry ice into an aging kettle, quickly screwing and sealing a tank cover of the aging kettle, putting the aging kettle into a roller heating furnace, rolling and aging at a set temperature, taking out, cooling, pouring out the drilling fluid, and performing performance test; the performance of the two decanted drilling fluids was compared. In the evaluation process, the treating agent for preventing the drilling fluid from being polluted by carbon dioxide is added, and the treating agent can be used for complexing with the carbon dioxide to form a semi-stable ionic liquid complex, so that the damage of the carbon dioxide to the drilling fluid can be reduced.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (13)
1. An indoor evaluation method of a treating agent for preventing a drilling fluid from being contaminated by carbon dioxide, comprising the steps of:
sequentially adding newly prepared drilling fluid and dry ice into an ageing kettle, and rapidly screwing and sealing a tank cover of the ageing kettle; then placing the ageing kettle into a roller heating furnace, rolling and ageing at a set temperature, taking out, cooling, pouring out drilling fluid, and performing performance test;
sequentially adding the newly prepared drilling fluid, a treating agent for preventing the drilling fluid from being polluted by carbon dioxide and dry ice into an aging kettle, quickly screwing and sealing a tank cover of the aging kettle, putting the aging kettle into a roller heating furnace, rolling and aging at a set temperature, taking out, cooling, and pouring out the drilling fluid for performance test; comparing the performance of the drilling fluid poured out twice;
the treating agent for preventing the drilling fluid from being polluted by carbon dioxide comprises a first component and a second component in a mass ratio of 90-95:5-10, wherein the first component is small molecular organic amine obtained by reacting organic acid with carbon number less than or equal to 10 with N' N-dimethyl-1, 3-propylene diamine, and the second component is an amidine compound and/or guanidine compound.
2. The indoor evaluation method according to claim 1, wherein the mass ratio of the drilling fluid, the treatment agent for preventing the drilling fluid from being contaminated with carbon dioxide, and the dry ice is 400.0:8.0:0.5-5.0.
3. The evaluation method according to claim 1, characterized by further comprising: after the ageing kettle is aged, firstly communicating a valve rod on the ageing kettle with a carbon dioxide indicating solution by using a pipeline, opening the valve rod on the ageing kettle, observing the color change of the carbon dioxide indicating solution, and judging whether CO exists or not 2 And after the gas is completely released, opening the cover of the aging kettle, and pouring out the drilling fluid for performance test.
4. The indoor evaluation method according to claim 1, wherein the aging temperature of the aging tank is 120 ℃ or the formation temperature for 16 hours.
5. The indoor evaluation method according to claim 1, wherein the first component is a small molecular organic amine prepared by reacting an organic acid having a carbon number of 10 or less with N' N-dimethyl-1, 3-propanediamine in the presence of a sodium fluoride-potassium bromide combined catalyst.
6. The method according to claim 5, wherein the organic acid comprises at least one of acetic acid, propionic acid, n-butyric acid, malonic acid, succinic acid, glutaric acid, adipic acid, and sebacic acid.
7. The method according to claim 6, wherein the organic acid is at least one of succinic acid, glutaric acid, and adipic acid.
8. The method according to claim 5, wherein the reaction is carried out in an inert atmosphere at a temperature of 110℃to 160℃for a period of 5 to 10 hours.
9. The indoor evaluation method according to claim 8, further comprising: reflux for removing water during the reaction or using molecular sieve for removing water.
10. The method of claim 1, wherein the amidine compound is selected from the group consisting of short-chain amidines.
11. The method according to claim 10, wherein the amidine compound is acetamidine hydrochloride or formamidine acetate.
12. The method of claim 1, wherein the guanidine compound is selected from the group consisting of short chain guanidine.
13. The method for evaluating the indoor environment according to claim 12, wherein the guanidine compound is tetramethylguanidine or polyhexamethylene guanidine.
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